Sounds like an interesting idea, not sure whether it should be allowed to target heroes - White has Snapback, after all, and compared to that this spell doesn’t even remove the hero/unit it’s targets, but is more flexible. And Grappling Hook is a fairly powerful spell as well. So on that baseline it could cost 3, just a touch on the expensive side? An niche spell that you tech if the opponent is playing a spec with fragile but value units or heroes. I can see this being useful against Peace engine or Vandy. An Immortal or maxband Rook? Not so much.
Maybe something like this:
Conscription (3)
Spell
Move a unit or hero into a patrol slot of your choice.
Note that this wouldn’t be able to target Rambaster or Juggernaut.